Lower rear seat - 12.2 lbs
Upper rear seat - 24.4 lbs
Styrofoam + tools = 4.4 lbs (seems off)
Headrests(3) = 3 lbs
Engine cover = 1.6 lbs
Rear seatbelt s= 5.4 lbs
3 floor mats = 4.8 lbs
Trunk wall trim(includes the rear battery / washer fluid covers and the black piece) = 9.4 lbs
Trunk spare tire cover (cardboard/rug) = 6.6lbs
Spare tire = (didn't weigh, but it should weigh 40.2lbs)
Draining the wiper fluid (4L of fluid, guestimating 4 KG's (I don't know the specific gravity of the fluid, but it will be less than water, so under 8.8 pounds)

So all in all, I get 120 pounds, but my scale sucks so it might be off.

The car is brutal without this stuff. My UR TBE was loud, after spending 2 days 9am-5pm at the track in a row, I was very happy to get this stuff back in my car.

 

thats cool, I didn't know that

 

I took everything out of the rear of my car. No backseats, spare tire, tools, jack, carpet, foam. Its naked back there.

 

You know how messed up the front:rear weight ratio must be now? At least take some stuff off the front of the car, or replace components with lighter versions.

 

exactly what i was thinking. thats one thing that we are known for. having such a balance. in a straight line i doubt it will effect much but anything else i would just put it all back in.